CYRIL CROSSLAND
M.A. Cantab., B.Sc. Lond., F.L.S., F.Z.S.
Marine Biologist to the Sudan Government

Cambridge:
at the University Press
1913


Cambridge:
PRINTED BY JOHN CLAY, M.A.
AT THE UNIVERSITY PRESS


TO MY WIFE

TO WHOSE BRAVE ENDURANCE OF A LARGE SHARE OF MY EXILE IS OWING MUCH OF WHATEVER I HAVE ACHIEVED, OR OF WHAT SUCCESS MAY YET BE MINE


PREFACE

IT is my fortune to know intimately a portion of the Red Sea coast, that between 18° N. and 22° N. on the western side. This must be one of the least known coastlines of the world. Until 1905, the Admiralty Chart shewed an area of 25 square miles of reef, which the surveys run for the approaches to the new town of Port Sudan have proved to be non-existent. Though a considerable distance north of this point has now been accurately surveyed, practically no details of the great barrier system of reefs leading up to the Rawaya Peninsula, or of the land inside the coastline, have yet been mapped.